Fan



CFI

Patented Mar. 3, 1936 UNITED STATES PATENT OFFICE -FAN Milvoy 'Horsky and William Paseka,

Cedar Rapids, Iowa Application August .16, 1935, Serial N'o. 36,528 3 Claims.V (Cl. 2304259) This invention relates to 'fans and has particular relation to fa motor driven device for moving large volumes of air :for cooling purposes.

In lthe art of conditioning 'air within a closed space to make it more pleasant for the occupants under conditions of high temperature, it is often the practice to lemploy devices such as the well known electric fan 'for circulating air to thus increase the rate vof evaporation from the skin thereby tending to decerase the body temperature. Such devices are usually in the form of motor driven fans, the fan diameter being relatively small and the ldevice securing circulation of the air by rotating the fan at high speed thus producing an air current of 'a relatively small cross sectional area traveling at relatively high velocities.

We have discovered that much better results are secured if 'a fan of relatively large dimensions is used and the fan rotated at slow speed to provide a more gentle movement of air currents of large volume.

We have found the two bladed propellers usually used for propelling heavier-'than-'air aircraft particularly suitable for this purpose, and we have devised a strong, simple, reliable, inexpensive and practically frictionless means for supporting and driving fans of this character.

It is accordingly an object of our invention to provide 'a fan of relatively large dimensions and means for rotatably supporting and driving the fan.

Another object of our invention is to provide a particularly simple and eifective supporting structure for a fan.

Other and further features and objects of our invention will be more apparent to those skilled in the art upon a consideration of the accompanying drawing and following specification, wherein is disclosed several exemplary embodiments of the invention, with the understanding, however, that such changes may be made therein as fall within the scope of the appended claims without departing from the spirit of the invention.

In said drawing:

Figure 1 is a view in side elevation of a fan and fan supporting and driving means considered according to one embodiment of our invention.

Figure 2 is a bottom View of the case or housing for supporting the driving mechanism of the device shown in Figure 1, and

Figure 3 is an enlarged sectional view of the device shown in Figure 1 and illustrating the parts of the device.

Referring now to the drawing, we preferably pass through suitable openings A'I6 inthe lugs Il. 10'

The case I'Il 'is cupped or recessed, as indicated at I'I, in order that alarge driven pulley I8 and a' small drive pulley I9 may 'be received within the case. A relatively small drive motor 2l is employed and this drive motor is .preferably of 15' the so-called vertical type and has a circular flange 23 at the upper end thereof. The circular flange 23 provided with `a vpair of rails 22 adapted to engage the under side of the case lIIl to vpermit mounting the motor '2| on the under side of 20 the case, and the armature shaft 24 of the motor projects through 'a 'suitable enlarged 'opening 26 in the case. The case is of relatively small cross sectional dimensions at this point because of the small diameter of the drive pulley I9. Y 25 The case I-0 is considerably enlarged at its other end in order that 'the large driven pulley I8 may lbe received within the case. Thecase is provided with a large circular opening 3I in the lower wall thereof and this opening 3| is 30 adapted to receive a flanged portion 32a of a collar 32. The collar has a horizontally extending flange 321) and the ilange 32h has openings therethrough in order that it may be secured, as by means of bolts 33, `to the under side of the case 35 I0. The collar 32a is recessed, as indicated at 34, to receive the stationary race of an anti-friction bearing 36. The rotating race of the bearing 36 "is adapted to receive a shaft 3'I upon which the large pulley I8 is mounted, the pulley being 40 keyed to the shaft 3'I by means of the key 35.

A downwardly extending portion 32o of the collar 32 is adapted to receive the upper end of a pipe 38. The lower end of the pipe 38 is provided with threads 39 on the outer face thereof for 45 receiving a cap 4I. This cap is of sufficient diameter at the lower inside wall thereof that the stationary race of anti-friction bearing 43 may be wedged between the inner wall of the cap and the end of the pipe or tube 38. The rotating race 50 of the anti-friction bearing 43 is tted witha forced nt to an enlarged portion 31a of the shaft 31 and the upper end of the enlarged portion 31a .is threaded on the outside wall thereof, as indicated at 3'Ib, in order that a nut 44 may be 55 the cup 4I to prevent the seepage of oil downwardly Valong the shaft'and through thecup.

The lower end of the shaft 31 is provided with a circular hub 5 I which hub is keyed to the shaft by means of the key 52, the hub 5l being held in place against longitudinal movement on the shaftv by means of the nut 53, A propeller 54 is mounted on the hub 5I, the shaft opening56 of theY propeller being of suicient diameter that the hub 5t may be received thereon. A hub cap 51 is provided on the outer or lower face of the propeller and the cap.51 and hub 5l are tightly locked on the propeller bymeans of bolts 58.

. YThe-large pulley I8 is driven from the small pulley i9 by means of a belt 59. On energization of the motor 2l, the shaft 31 is rotated at relativelylow speed to rotate the propeller 54, but this speed issucient to move a very large volume ofV air andrit has been found that this large volume of slowly moving air is more efficacious in producing acool sensation than isa small diamevter air blast of highrvelocity. AV motor of relatively low power may be used for driving the propeller 54, yet a large vvolume of air is moved by the propeller. The device is extremely simple in structure and'reliable in operation.

, It is apparent that modifications may be made by those skilled inthe art and such modifications may be made without departing fromthe spirit and scope of -m'y'invention as set forth in the appended claims.V l

l We claimV as ourinventin; e

.e 1. A fan comprising a case,` means for secur-` ing the case to the ceiling, a motor, means for mounting the motor on the lower face'of the case with-- the drive shaft thereof projecting through and into the case, a drivepulley on the drive shaft, the case having another opening therethrough, a collar in the opening and depending therefrom, a bearing in the collar a tube disposed inthe collar and projecting therebelow,

a cap on the lower end of the tube, a bearing in the cap, a shaft rotatably mounted in the bearings and projecting upwardly through the last named opening in the case and through the cap, a hub on the projecting end of the shaft, a propeller on the hub, a driven pulley on the upper Y end of the shaft within the case, and belt means from the drive to the driven pulley.

2. A fan comprising a case having openings therein, a motor, means for mounting the motor on the lower face of the case with the drive shaft thereof projecting through and into the case, a drive pulley on the drive shaft, a collar in another opening in the case and depending therefrom, a bearingin the collar, a tube disposed in the collar and projecting therebelow, a cap on the lower end of the tube, a bearing in the cap,

'a shaft varying in diameter rotatably mounted through, a collar in another opening and'dependv ing therefrom, a bearing mounted in the collar., a tube disposed in the collar and extending there# below, a retaining cap on the lower end of the tube, a bearing mounted in the retaining cap, a shaft extending into the case, mounted'for rotation in the bearings and having an enlarged partially threaded portion for `mounting in the lower bearing, a flange on thelower part offthe enlarged portion of the shaft, a locking nut on the threaded part of the. enlarged portion of the shaft so that the lower bearing may be locked; between; the nut and the flange tohold the shaft in a stable vertical position, ahub mounted on the lower end ofthe shaft, a'propeller on the hub, a pulley on the upper end of the shaft, anda belt connecting the driving means and said pulley;

` y imvosrY HoRsKY. WILLIAMfPASEKA- 

